from sqlalchemy import (
    Column,
    Integer,
    String,
    DateTime,
    Text,
    Float,
    ForeignKey,
    Boolean,
)
from sqlalchemy.orm import relationship
from datetime import datetime
from app.db.base import Base


class Item(Base):
    __tablename__ = "items"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String, index=True, nullable=False)
    description = Column(Text)
    sku = Column(String, unique=True, index=True, nullable=False)
    barcode = Column(String, unique=True, index=True)
    unit_price = Column(Float, nullable=False)
    cost_price = Column(Float)
    quantity_in_stock = Column(Integer, default=0)
    minimum_stock_level = Column(Integer, default=0)
    maximum_stock_level = Column(Integer)
    reorder_point = Column(Integer, default=0)
    is_active = Column(Boolean, default=True)

    category_id = Column(Integer, ForeignKey("categories.id"))
    supplier_id = Column(Integer, ForeignKey("suppliers.id"))

    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    category = relationship("Category", back_populates="items")
    supplier = relationship("Supplier", back_populates="items")
    transactions = relationship("StockTransaction", back_populates="item")